objective-C 的代码文件组织

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上一篇中，所有代码都是放在同一个文件main.h中的，这显然不是一个好的方式，代码多了以后，看着就头大。可以将其进行拆分：

1、将所有枚举、结构的定义单独放在一个文件ShapeDef.h中

//定义“几何形状类型”枚举
typedef enum
{
	kCircle,
	kRectangle,
	kOblatesShperoid   
} ShapeType;
 
//定义“几何形状颜色”枚举
typedef enum
{
	kRedColor,
	kGreenColor,
	kBlueColor
} ShapeColor;
 
//定义“几何形状矩形区域”结构
typedef struct
{
	int x,y,width,height;
} ShapeRect;
 
 
//定义“几何形状”结构
typedef struct
{
	ShapeType type;
	ShapeColor fillColor;
	ShapeRect bounds;
}Shape;

2、将所有方法都放在另一个文件ShapeMethod.h中

#import "ShapeDef.h"

//将“颜色枚举“转换为字符串
NSString *colorName(ShapeColor colorName)
{
	switch (colorName) 
	{
		case kRedColor:
			return @"red";
			break;
		case kGreenColor:
			return @"green";
			break;
		case kBlueColor:
			return @"blue";
		default:
			return @"no clue";
			break;
	}
}

//画圆
void drawCircle(ShapeRect bounds,ShapeColor fillColor)
{
	NSLog(@"drawing a circle at (%d,%d,%d,%d) in %@",bounds.x,bounds.y,bounds.width,bounds.height,colorName(fillColor));
}//drawCircle
 
//画矩形
void drawRectangle(ShapeRect bounds,ShapeColor fillColor)
{
		NSLog(@"drawing a rectangle at (%d,%d,%d,%d) in %@",bounds.x,bounds.y,bounds.width,bounds.height,colorName(fillColor));
}//drawRectangle
 
//画椭圆形
void drawEgg(ShapeRect bounds,ShapeColor fillColor)
{
	NSLog(@"drawing an egg at (%d,%d,%d,%d) in %@",bounds.x,bounds.y,bounds.width,bounds.height,colorName(fillColor));
}//drawEgg
 
//画几何形状
void drawShapes(Shape shapes[],int count)
{
	int i;
	for(i=0;i<count;i++)
	{
		switch (shapes[i].type) 
		{
			case kCircle:
				drawCircle(shapes[i].bounds,shapes[i].fillColor);
				break;
			case kRectangle:
				drawRectangle(shapes[i].bounds,shapes[i].fillColor);
				break;
			case kOblatesShperoid:
				drawEgg(shapes[i].bounds,shapes[i].fillColor);
				break;
			default:
				break;
		}
	}
}//drawShapes

3、最后在主文件Main.m中使用ShapeMethod.h

#import "ShapeMethod.h"


int main () {    

	Shape shapes[3];
	 
	ShapeRect rect0 ={0,0,10,30};
	shapes[0].type = kCircle;
	shapes[0].fillColor = kRedColor;
	shapes[0].bounds = rect0;  
	 
	ShapeRect rect1 = {30,40,50,60};
	shapes[1].type = kRectangle;
	shapes[1].fillColor = kGreenColor;
	shapes[1].bounds = rect1;
	 
	ShapeRect rect2 = {15,18,37,39};
	shapes[2].type = kOblatesShperoid;
	shapes[2].fillColor = kBlueColor;
	shapes[2].bounds = rect2;  
	 
	drawShapes(shapes, 3);
	
    
    return 0;
}

注：ShapeDef.h,ShapeMethod.h,Main.m三个文件均处于同一个项目的同一个目录中。